Which brand of UPS uninterruptible power supply is good? Many models of the price gap is very large, what is said "?

Foreign brands on the three big: Schneider (apc and MLG two brands), Emerson, Eaton (acquisition of MLG office partners, AIC, Santak three brands), of which Eaton's Santak has the highest market share in China, the main focus on the small and medium-power market below 80KVA, cost-effective, apc famous machine smart series is an online interactive, price is high, the quality is Not good, the chip write code more, late soft failure, and soft failure is not easy to repair, only the manufacturer can guarantee a good repair, but the fee is much higher. All the brands under the three brands, except for Santak, are high-end positioning, the price is expensive.

Domestic goods KELONG Kewa, Crestec, easy three is considered the largest domestic, kelong in some foreign countries also have a certain high-end market, the remaining two foreign markets, but are low-end market, relatively speaking, KELONG Kewa market share and quality is still very good, the quality of the three major foreign brands than will not be worse, Crestec, easy to specialize in Part of the product is still very good. The price of the three major domestic brands are about the same, Kewa kelong have part of the model price is high, easy to the user's price is high, because they are high Gongguan costs, the actual price of the product is not high, and some of them are also very cheap.